I have felt underwhelmed by slowing effects in Pacto. A change I have tried out and found to work quite well is to apply an additional
1 BW slow to Cv, Cm, Ch or EL TuGs. So a skirmishing/mounted UG inflicting a slow on Cv, Cm, Ch or El UG slows it by 2 BW, a foot UG slows it by 3 BW. The extra 1BW only applies once. So if two foot UGs both inflict slows on the same Cv UG it is only slowed by 5 BW, not 6 BW.
This is not an official change but one you might like to try playing.
Regards
Richard Jeffrey-Cook